<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>approval</title>
  </head>
  <body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
  </body>
</html>
<script>
function placeholderPic() {
  document.documentElement.style.fontSize = document.documentElement.offsetWidth / 60 + 'px' // 同上
}
placeholderPic()
window.onresize = function() { // 窗口改变时再次执行一次函数便可
  placeholderPic()
}
</script>
